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b in (-oo:+oo)
(2/3)*b-3 = -25/9 // + -25/9
(2/3)*b-(-25/9)-3 = 0
(2/3)*b+25/9-3 = 0
2/3*b-2/9 = 0 // + 2/9
2/3*b = 2/9 // : 2/3
b = 2/9/2/3
b = 1/3
b = 1/3
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